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Openvpn 连接并响应 ping 但无法访问互联网

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Openvpn 连接并响应 ping 但无法访问互联网

我有一个在 raspian 上运行的 openvpn 服务器和一个在 osx 上运行的 tunnelblick 客户端。我可以正常连接到 VPN，但无法访问互联网。服务器可以正常响应 ping，并且路由器中的端口已打开。有人知道可能出了什么问题吗？

这是客户端日志： http://pastebin.com/zvBXPv4D

这是服务器日志： http://pastebin.com/bBsaRK6c

客户端配置：

client
dev tun
proto udp
remote <server external ip> 1194 #change this
resolv-retry infinite
nobind
persist-key
persist-tun
mute-replay-warnings
ns-cert-type server
key-direction 1
cipher AES-128-CBC
comp-lzo
verb 1
mute 20

ca /Users/user1/vpn/ca.crt #change this
cert /Users/user1/vpn/client1.crt #change this
key /Users/user1/vpn/client1.key #change this


<tls-auth>
#
# 2048 bit OpenVPN static key
#
-----BEGIN OpenVPN Static key V1-----
#removed for pastebin
-----END OpenVPN Static key V1-----

</tls-auth>

服务器配置：

dev tun
proto udp
port 1194
ca /etc/openvpn/easy-rsa/keys/ca.crt
cert /etc/openvpn/easy-rsa/keys/server.crt # SWAP WITH YOUR CRT NAME
key /etc/openvpn/easy-rsa/keys/server.key # SWAP WITH YOUR KEY NAME
dh /etc/openvpn/easy-rsa/keys/dh1024.pem # If you kept 1024, change it to dh1024.pem
server 10.8.0.0 255.255.255.0
tls-auth /etc/openvpn/easy-rsa/keys/ta.key 0
# server and remote endpoints
ifconfig 10.8.0.1 10.8.0.2
# Add route to Client routing table for the OpenVPN Server
push "route 10.8.0.1 255.255.255.255"
# Add route to Client routing table for the OpenVPN Subnet
push "route 10.8.0.0 255.255.255.0"
# your local subnet
push "route 10.0.1.2 255.255.255.0" # Enter PI LAN PI
# Set primary domain name server address to the SOHO Router
# If your router does not do DNS, you can use Google DNS 8.8.8.8
push "dhcp-option DNS 10.8.0.1" 
# Override the Client default gateway by using 0.0.0.0/1 and
# 128.0.0.0/1 rather than 0.0.0.0/0. This has the benefit of
# overriding but not wiping out the original default gateway.
push "redirect-gateway def1"
client-to-client
duplicate-cn
keepalive 10 120
cipher AES-128-CBC
comp-lzo
user nobody
group nogroup
persist-key
persist-tun
status /var/log/openvpn-status.log 20
log /var/log/openvpn.log
verb 5

sysctl net.ipv4.ip_forward 给出：

net.ipv4.ip_forward = 1

ip route show 显示：

default via 10.0.1.1 dev eth0 
10.0.1.0/24 dev eth0  proto kernel  scope link  src 10.0.1.2 
10.8.0.0/24 via 10.8.0.2 dev tun0 
10.8.0.2 dev tun0  proto kernel  scope link  src 10.8.0.1

iptables -L -v 给出：

Chain INPUT (policy ACCEPT 15492 packets, 1793K bytes)
 pkts bytes target     prot opt in     out     source               destination         
   88  5861 ACCEPT     all  --  tun+   any     anywhere             anywhere            
    1    70 ACCEPT     udp  --  eth0   any     anywhere             anywhere             state NEW udp dpt:openvpn

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 ACCEPT     all  --  tun0   eth0    10.8.0.0/24          10.0.1.0/24          ctstate NEW
   13   948 ACCEPT     all  --  tun+   any     anywhere             anywhere            
    0     0 ACCEPT     all  --  tun+   eth0    anywhere             anywhere             state RELATED,ESTABLISHED
    4   776 ACCEPT     all  --  eth0   tun+    anywhere             anywhere             state RELATED,ESTABLISHED

Chain OUTPUT (policy ACCEPT 18526 packets, 3880K bytes)
 pkts bytes target     prot opt in     out     source               destination         
   27  2584 ACCEPT     all  --  any    tun+    anywhere             anywhere

答案1

好的，我解决了这个问题。iptables 中的规则存在问题。我删除了 FORWARD 链中的第一个规则，然后就可以 ping 外部 IP:s。我还将 server.conf 中的 DNS 服务器更改为外部 DNS 服务器，之后一切正常。

答案2

  • 检查客户端的路由，特别是默认路线。
  • 如果路由正确，请检查（使用tcpdump或wireshark其他数据包捕获程序）数据包实际发送到哪里（检查两个接口）。
  • 如果数据包发送/接收正确 - 检查 DNS 是否正常工作（客户端正在尝试使用哪个 DNS 服务器以及 DNS 查询/响应数据包是否通过）。

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